What are hooks in React? Name some commonly used hooks.

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What are Hooks in React?

Hooks are special functions in React that let you “hook into” React features such as state and lifecycle methods directly from functional components.

• Before Hooks, class components were needed for handling state and lifecycle.

• With Hooks (introduced in React 16.8), functional components became powerful enough to manage state, side effects, context, and more.

• They make code simpler, reusable, and cleaner.

Commonly Used Hooks in React

1. useState

   • Manages local state in functional components.

   • Example: toggles, counters, form inputs.

2. useEffect

   • Handles side effects like data fetching, subscriptions, DOM manipulation, or timers.

   • It replaces lifecycle methods like componentDidMount, componentDidUpdate, and componentWillUnmount.

3. useContext

   • Provides access to React’s Context API values without prop drilling.

   • Used for global data like authentication, themes, or language settings.

4. useRef

   • Creates a mutable reference that persists across re-renders.

   • Often used for accessing/controlling DOM elements or storing values without causing re-renders.

5. useReducer

   • An alternative to useState for more complex state logic.

   • Works similarly to Redux with state and action management.

6. useMemo

   • Optimizes performance by memoizing values so they don’t recalculate on every render.

7. useCallback

   • Memoizes functions to prevent unnecessary re-creations during re-renders.

   • Helps optimize child component rendering.

✅ In short:

• Hooks allow functional components to be stateful and powerful.

• Common hooks: useState, useEffect, useContext, useRef, useReducer, useMemo, useCallback.

Read More :

What are React components, and what are the two types of components?

Explain the difference between state and props in React.

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